【摘要】 应用蚕豆初生根尖细胞微核技术研究Ｌａ３＋、Ｓｍ３＋、Ｙ３＋、Ｇｄ３＋等稀土金属离子的诱变性，发现稀土金属离子在达到一定剂量时均可引起蚕豆根尖细胞微核率的升高，与对照组相比差异显著（Ｐ＜０．０５，Ｐ＜０．０１）。在早期生长试验中，应用７ｄ生长的蚕豆幼苗干重表征蚕豆的早期生长情况，比较蚕豆的发芽率及幼苗干重，反映稀土金属离子对蚕豆早期生长发育的毒性。结果表明，稀土金属离子在高浓度时对蚕豆的发芽率有一定影响，其中以Ｓｍ３＋、Ｙ３＋、Ｇｄ３＋更为明显；从蚕豆幼苗干重可以看出，稀土离子在低浓度时对蚕豆早期生长具有刺激作用，并具最适浓度，在高浓度时均具有抑制作用，且随着浓度的升高，抑制作用增强。更多还原

【Abstract】 Mutagennicity of rare earth element(REE) ions La3+, Sm3+, Y3+ and Gd3+ was evaluated with micronucleus test in vicia faba root tip cells. REE ions at certain concentrations induced micronucleus formation significantly (P<0.05, P<0.01). The germination rate and the dry weight of 7-day-old seedling were used as indexes to represent the effects of REE ions on the growth of vicia faba. The germination rates of vicia faba seed were inhibited at high concentrations ( 16 and 12mmol/L) of Sm3+, Y3+ and Gd 3+ . The average seedling dry weights were stimulated at low REE ion concentrations, but inhibited in high concentrations. As the concentrations of REE ions became higher, the inhibitory effect increased.更多还原